JP2009210194A - Kiln control method, and baking device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a kiln control method and a baking device suitable for obtaining a baked object having stable characteristics. <P>SOLUTION: The kiln 1 is provided with a first furnace chamber 11 to a seventh furnace chamber 17 between a conveyance preparation chamber 10 and an extraction preparation chamber 18. When controlling furnace pressure, the internal pressure P1-P7 of the first furnace chamber 11 to the seventh furnace chamber 17 is maintained higher than atmospheric pressure Pa. The internal pressure P1 of the first furnace chamber 11 adjacent to the conveyance preparation chamber 10 is maintained higher than the internal pressure P2 of the second furnace chamber 12. The internal pressure P7 of the seventh furnace chamber 17 adjacent to the extraction preparation chamber 18 is maintained higher than the internal pressure P6 of the sixth furnace chamber 16. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a firing furnace control method and a firing apparatus.

For example, in a firing furnace used when firing ceramics in an atmosphere, care must be taken so that the atmosphere in the furnace chamber is not disturbed when the object to be fired is carried in and taken out. This is because if the atmosphere in the furnace chamber is disturbed, the characteristics of the sintered body will change. As one of the means, the replacement chamber and the adjacent furnace chamber are closed by a shutter, and the air that has entered the product to be fired into the loading-side replacement chamber is replaced with an inert gas such as N ₂ gas. Thereafter, the shutter is opened, and the object to be fired is fed into the furnace chamber.

  When the fired product is taken out after firing, the fired product is previously taken into the take-out side replacement chamber filled with an inert gas, and then the shutter provided between the furnace chamber and the take-out side replacement chamber is closed. Then, the fired product is taken out from the take-out side replacement chamber. Thereafter, the air that has entered the extraction-side replacement chamber in accordance with the baking product extraction operation is replaced with an inert gas.

  In the atmosphere firing furnace, since the state of the atmosphere gas in the furnace chamber has a significant influence on the characteristics of the fired product, various atmosphere gas control techniques have been proposed and put into practical use. For example, Patent Document 1 discloses that the inside of a firing furnace is set to a sintering condition having a temperature gradient in the transfer direction of the sintered body, so that the heating process is performed from the sintered body transferred in the sintering furnace. A sintering method and a sintering furnace are disclosed in which the generated gas is smoothly discharged out of the sintering furnace by the flow of the inert gas or the like. Specifically, the furnace pressure on the outlet side is increased and the furnace pressure on the inlet side is decreased.

  Further, unlike Patent Document 1, active furnace pressure control is not performed, and the furnace pressure increases at the firing stable part (high temperature part) in the firing furnace due to the influence of the firing temperature, and at the inlet and outlet parts. A technique using the phenomenon that the furnace pressure is lowered is also well known.

  However, even when any conventional technique is applied, when the unfired product is introduced into the carry-in replacement chamber, and when the fired product is taken out from the take-out replacement chamber, the replacement chamber is at an internal pressure higher than atmospheric pressure. Since it is open to the atmosphere, its internal pressure drops to atmospheric pressure. Although the replacement chamber and the furnace chamber are temporarily separated by a shutter, the sealing performance of the shutter itself is not high due to its structure. For this reason, the internal pressure fluctuation of the replacement chamber affects the internal pressure of the furnace chamber, causing fluctuations in the internal pressure, fluctuations in the atmospheric gas composition ratio in the furnace chamber, fluctuations in the furnace chamber temperature, and fluctuations in the characteristics of the sintered body. End up.

Moreover, in the case of Patent Document 1, the furnace pressure on the outlet side is increased and the furnace pressure on the inlet side is designed to be low, which is limited to unidirectional temperature gradient control over the entire length of the firing furnace, and stable sintering. It is not suitable for zone control, which is important for obtaining the body.
JP-A-6-346104

  An object of the present invention is to provide a firing furnace control method and a firing apparatus suitable for obtaining a fired product having stable characteristics.

1. Firing furnace control method In order to solve the above-described problems, the firing furnace control method according to the present invention is applied to control the furnace pressure of the firing furnace. The firing furnace includes the first furnace chamber to the nth furnace chamber divided into a plurality of n between a carry-in preparation chamber for carrying in an unfired product and a take-out preparation chamber for taking out a sintered product. .

  In the firing furnace control method according to the present invention, in controlling the internal pressure of the firing furnace described above, the internal pressure of the first furnace chamber to the nth furnace chamber is kept higher than atmospheric pressure, and the first adjacent to the carry-in preparation chamber. The internal pressure of one furnace chamber is maintained higher than the internal pressure of the second furnace chamber adjacent to the first furnace chamber, and the internal pressure of the nth furnace chamber adjacent to the extraction preparation chamber is adjacent to the nth furnace chamber. And maintaining the pressure higher than the internal pressure of the (n-1) furnace chamber.

  As described above, in the firing furnace control method according to the present invention, the internal pressure of the first furnace chamber to the nth furnace chamber is kept higher than the atmospheric pressure. There is no room for entry into the furnace chamber.

  Moreover, since the internal pressure of the first furnace chamber adjacent to the carry-in preparation chamber is kept higher than the internal pressure of the second furnace chamber adjacent to the first furnace chamber, the carry-in preparation chamber is brought into the atmosphere by carrying in the object to be fired. Even when the internal pressure is released and the internal pressure is lowered, the high internal pressure of the first furnace chamber adjacent to the carry-in preparation chamber becomes a “wall”, and the atmospheric gas is directed from the second and subsequent furnace chambers toward the carry-in preparation chamber. To prevent the flow of water. The action of blocking the flow of the atmospheric gas is naturally maintained even in the firing process.

  In addition to this, the internal pressure of the nth furnace chamber adjacent to the extraction preparation chamber is kept higher than the internal pressure of the (n-1) furnace chamber adjacent to the nth furnace chamber. Even if the extraction preparation chamber is opened to the atmosphere by the above and the internal pressure drops, the high internal pressure of the nth furnace chamber adjacent to the extraction preparation chamber becomes a “wall”, and preparations for extraction from the furnace chamber before the nth furnace chamber are made. Blocks the flow of atmospheric gas toward the chamber. Even in this firing step, the action of blocking the flow of the atmospheric gas is naturally maintained.

  Eventually, in the row of the second furnace chamber to the (n-1) furnace chamber, the high internal pressures of the first furnace chamber and the nth furnace chamber on both sides become “walls”, and the circulation of atmospheric gas between the furnace chambers occurs. It will be sealed so that there is no. As a result, fluctuations in the atmospheric gas component ratio and the internal pressure of the firing stable portion constituted by the furnace chamber or furnace chamber group in the intermediate portion are suppressed, and a fired product having stable characteristics can be obtained.

Also in the firing furnace to which the firing furnace control method according to the present invention is applied, the air that has flowed in by unloading and unloading is replaced with an inert gas on the unfired material loading side and the sintered product unloading side, as in the past. It has a loading preparation room and an extraction preparation room. Therefore, as before, the loading preparation chamber and the adjacent furnace chamber are closed by the shutter, and the air that has entered the unburned material into the loading preparation chamber is replaced with an inert gas such as N ₂ gas, for example. Then, the shutter can be opened, and the unfired product can be fed from the carry-in preparation chamber into the furnace chamber. The internal pressures of the carry-in preparation chamber and the extraction preparation chamber after replacement with the inert gas may be higher or lower than the internal pressures of the first furnace chamber and the (n-1) furnace chamber.

  When taking out the sintered product, the sintered product was previously taken into the extraction preparation chamber filled with an inert gas, and then provided between the furnace chamber and the extraction preparation chamber with a certain cooling time. The shutter is closed, and in this state, the sintered product is taken out from the take-out preparation chamber. Thereafter, the air that has entered the extraction preparation chamber as a result of the sintered product extraction operation can be replaced with an inert gas.

  Therefore, it is possible to prevent the atmosphere in the furnace chamber from being disturbed when the object is carried in and out, and to suppress fluctuations in the characteristics of the sintered body due to the atmosphere disturbance in the furnace chamber.

  In addition, since the unfired material carried into the carry-in preparation chamber is sent to the first furnace chamber to the n-th furnace chamber and fired, and the sintered product is taken out from the take-out preparation chamber, the first furnace chamber to the nth Zone control is possible by controlling the atmosphere in the furnace chamber. According to the zone control, it is possible to control the atmospheres in the first furnace chamber to the nth furnace chamber and perform optimum atmosphere control. For example, in the first furnace chamber to the nth furnace chamber, the mixing ratio of the inert gas and oxygen can be individually selected and controlled, and a flexible atmosphere control according to the degree of firing can be performed. A sintered body having the characteristics can be obtained.

  As one embodiment, an r-th furnace chamber (r is a natural number) having an internal pressure higher than these may be included between the second furnace chamber and the (n-1) furnace chamber. In such a case, as long as the condition that the internal pressure of the first furnace chamber and the nth furnace chamber is higher than the internal pressure of the second furnace chamber and the (n-1) furnace chamber is satisfied, This is because an atmosphere gas flow large enough to affect the properties of the sintered product is not generated.

  The internal pressure is controlled by adjusting the relationship between (gas supply amount / time) and (gas exhaust amount / time). This is because the internal pressure is ultimately determined by the balance with the atmospheric gas supply amount and the atmospheric gas exhaust amount.

  The internal pressure may be adjusted in all of the first furnace chamber to the nth furnace chamber, but from the viewpoint of the object of the present invention, the internal pressure is adjusted at least in the first furnace chamber and the nth furnace chamber. Need to be done.

2. Baking apparatus The present invention further discloses a baking apparatus. Basically, the firing apparatus may have any configuration suitable for carrying out the above-described firing furnace control method. That is, the firing apparatus according to the present invention includes a firing furnace. The firing furnace includes the first furnace chamber to the nth furnace chamber divided into a plurality of n between a carry-in preparation chamber for carrying in an unfired product and a take-out preparation chamber for taking out a sintered product. .

  In the first to nth furnace chambers, the internal pressure is kept higher than the atmospheric pressure. Moreover, the internal pressure of the first furnace chamber adjacent to the carry-in preparation chamber is kept higher than the internal pressure of the second furnace chamber adjacent to the first furnace chamber. Furthermore, the internal pressure of the nth furnace chamber adjacent to the extraction preparation chamber is kept higher than the internal pressure of the (n-1) furnace chamber adjacent to the nth furnace chamber.

  The firing apparatus according to the present invention can include a gas supply device and a gas discharge device. In this case, the internal pressure is controlled by adjusting the relationship between the gas supply amount by the gas supply device and the gas discharge amount by the gas discharge device.

  The gas supply device and the gas discharge device do not need to be provided in all of the first furnace chamber to the nth furnace chamber, and may be provided in at least each of the first furnace chamber and the nth furnace chamber. .

  The firing apparatus according to the present invention includes a firing furnace, a gas supply device, and a gas discharge device as its specific configuration. The firing furnace has a carry-in preparation room, an extraction preparation room, and a furnace room. The carry-in preparation chamber is disposed on the unfired product carry-in side and replaces the internal air with an inert gas. The said extraction preparation chamber is arrange | positioned at the sintered compact extraction side, and replaces internal air with an inert gas. The furnace chamber has a first furnace chamber to an nth furnace chamber which are divided into n consecutive chambers.

  The gas supply device and the gas discharge device are provided in pairs in at least the carry-in preparation chamber, the extraction preparation chamber, the first furnace chamber, and the nth furnace chamber, respectively. The gas supply device includes a gas supply amount adjustment unit, and the gas discharge device includes a gas discharge amount adjustment unit.

  It is clear from the above description that the above-described firing apparatus is suitable for carrying out the firing furnace control method according to the present invention.

As a specific form, the gas supply device provided in the carry-in preparation chamber and the extraction preparation chamber supplies only inert gas. Further, the gas supply device provided in the first furnace chamber and the second furnace chamber has a function of controlling the mixing ratio of the inert gas and the O ₂ gas. The gas supply device and the gas discharge device may be provided in all of the first furnace chamber to the nth furnace chamber, or only in a part thereof, for example, the first furnace chamber and the nth furnace chamber. It may be.

  As described above, according to the present invention, it is possible to provide a firing furnace control method and a firing apparatus suitable for obtaining a fired product having stable characteristics.

  Other objects, configurations and advantages of the present invention will be described in more detail with reference to the accompanying drawings. However, the attached drawings are merely examples.

  FIG. 1 is a diagram showing a schematic configuration of a firing apparatus according to the present invention and a firing furnace control method using the firing apparatus. In FIG. 1, the upper half (A) shows the configuration of the firing apparatus, and the lower half (B) is a graph showing the relationship between the position-pressure (furnace pressure, internal pressure) related to the control method. The position corresponds to the position of the firing furnace 1.

  The firing furnace and firing apparatus in the present invention include a type that falls within the category of a continuous firing furnace. Specific examples include tunnel furnaces, roller kilns, pusher furnaces, ceramic chain conveyor furnaces, mesh belt firing furnaces, walking beam firing furnaces, and the like.

  In the illustrated firing apparatus, the firing furnace 1 includes a plurality of n = between the carry-in preparation chamber 10 used for carrying in the unfired product 41 and the take-out preparation chamber 18 used for taking out the sintered product 42. 7 has a first furnace chamber 11 to a seventh furnace chamber 17. The number n of furnace chambers is an arbitrary number.

In the first furnace chamber 11 to the seventh furnace chamber 17, the internal pressure is kept higher than the atmospheric pressure. Further, the internal pressure P1 of the first furnace chamber 11 adjacent to the carry-in preparation chamber 10 is kept higher than the internal pressure P2 of the second furnace chamber 12 adjacent to the first furnace chamber 11. Further, the internal pressure P7 of the seventh furnace chamber 17 adjacent to the extraction preparation chamber 18 is kept higher than the internal pressure P6 of the sixth furnace chamber 16 adjacent to the seventh furnace chamber 17. A shutter 101 is disposed between the carry-in preparation chamber 10 and the first furnace chamber 11, and a shutter 181 is also disposed between the extraction preparation chamber 18 and the seventh furnace chamber 17.
FIG. 1A shows a firing state in which the shutters 101 and 181 are closed.

  The first furnace chamber 11 to the seventh furnace chamber 17 are arranged in a line, and a partition wall is provided between the furnace chambers. The first furnace chamber 11 to the seventh furnace chamber 17 include gas supply devices (211 and 212) to (271 and 272) and gas discharge devices 31 to 37 as internal pressure adjusting means. The internal pressure of the first furnace chamber 11 to the seventh furnace chamber 17 adjusts the relationship between the gas supply amounts by the gas supply devices (211 and 212) to (271 and 272) and the gas discharge amounts by the gas discharge devices 31 to 37. Is controlled by

  The gas supply devices (211, 212) to (271, 272) and the gas discharge devices 31 to 37 need not be provided in all of the first furnace chamber 11 to the seventh furnace chamber 17. It suffices that at least each of the first furnace chamber 11 and the seventh furnace chamber 17 is provided. The gas supply devices (211 and 212) to (271 and 272) and the gas discharge devices 31 to 37 are paired. The substance of the gas supply devices (211, 212) to (271, 272) is a gas supply amount adjustment mechanism such as a mass controller. As the gas discharge devices 31 to 37, those having a gas discharge amount adjustment valve are used.

The carry-in preparation chamber 10 is provided with a gas supply device 20 and a gas discharge device 30, and the take-out preparation chamber 18 is provided with a gas supply device 28 and a gas discharge device 37. The gas supply devices 20 and 28 provided in the carry-in preparation chamber 10 and the extraction preparation chamber 18 supply only an inert gas such as N ₂ gas. Moreover, the gas supply apparatuses (211 and 212) to (271 and 272) provided in the first furnace chamber 11 to the seventh furnace chamber 17 have a function of controlling the mixing ratio of N ₂ gas and O ₂ gas. The gas supply devices (211, 212) to (271, 272) and the gas discharge devices 31 to 37 may be provided in all of the first furnace chamber 11 to the seventh furnace chamber 17, or only in a part thereof. It may be done. For example, there may be a case where only the first furnace chamber 11 and the seventh furnace chamber 17 are provided.

  When the control method according to the present invention is executed using the above-described baking apparatus, first, the unfired product 41 is carried into the carry-in preparation chamber 10. The unfired product 41 is an unfired dielectric ceramic molded body, an unfired magnetic ceramic molded body, a composite ceramic molded body thereof, or the like, and is generally mounted on a transfer tray, a carriage, or the like (not shown), and the first furnace The inside of the chamber 11 to the seventh furnace chamber 17 is conveyed in the direction indicated by the arrow F.

After carrying the unfired product 41 into the carry-in preparation chamber 10, N ₂ gas is introduced into the carry-in preparation chamber 10 from the gas supply device 20, and the air entered at the time of carry-in is replaced with N ₂ gas. In this replacement step, the shutter 101 that partitions the carry-in preparation chamber 10 and the first chamber 11 is preferably closed. When the internal pressure of the carry-in preparation chamber 10 reaches a predetermined value, the shutter 101 is opened, and the unfired product 41 is fed into the first furnace chamber 11 using an appropriate transfer means 5 such as a pusher. In the first furnace chamber 11 to the seventh furnace chamber 17, the sintered objects previously sent are arranged in a line in a state of being sequentially aligned. When sent into the interior, the entire row of the objects to be sintered is sent out in the direction indicated by the arrow F, and the objects to be sintered located in the foremost line are sintered as sintered products 42 in the extraction preparation chamber 18. Captured inside. Then, inside the extraction preparation chamber 18, it is slow cooling in N ₂ gas atmosphere.

The sintered product 42 cooled to a predetermined temperature inside the extraction preparation chamber 18 is extracted from the extraction preparation chamber 18 to the outside by a known extraction mechanism. Prior to this extraction step, the shutter 181 that partitions the extraction preparation chamber 18 and the seventh furnace chamber 17 is closed. Then, after taking out the outside sinter 42 from takeout preparation chamber 18, by the cooperation of a gas supply apparatus 28 and the gas discharge device 38, the air present in unloading preparation room 18, was replaced by N ₂ gas Prepare for the next step.

  Separately from the feeding and taking-out steps described above, the internal pressures of the first furnace chamber 11 to the seventh furnace chamber 17 are controlled. In controlling the internal pressures of the first furnace chamber 11 to the seventh furnace chamber 17, as shown in FIG. 1B, the minimum internal pressure Pmin of the first furnace chamber 11 to the seventh furnace chamber 17 is determined from the atmospheric pressure Pa. Also keep it high. Further, the internal pressure P1 of the first furnace chamber 11 adjacent to the carry-in preparation chamber 10 is kept higher than the internal pressure P2 of the second furnace chamber 12 adjacent to the first furnace chamber 11. Similarly, the internal pressure P7 of the seventh furnace chamber 17 adjacent to the extraction preparation chamber 18 is kept higher than the internal pressure P6 of the sixth furnace chamber 16 adjacent to the seventh furnace chamber 17. The firing process is performed in this state.

  As described above, since the internal pressure of the first furnace chamber 11 to the seventh furnace chamber 17 is kept higher than the atmospheric pressure Pa, the atmosphere is brought into the first furnace chamber 11 to the seventh furnace chamber 17 in the firing step. There is no room for entry.

  Moreover, since the internal pressure P1 of the first furnace chamber 11 adjacent to the carry-in preparation chamber 10 is kept higher than the internal pressure P2 of the second furnace chamber 12 adjacent to the first furnace chamber 11, the object to be sintered 41 is carried in. Thus, even when the carry-in preparation chamber 10 is opened to the atmosphere and the internal pressure thereof decreases, the high internal pressure P1 of the first furnace chamber 11 adjacent to the carry-in preparation chamber 10 becomes a “wall”, and the second furnace chamber 12 and later. The flow of atmospheric gas from the furnace chamber toward the carry-in preparation chamber 10 can be blocked. The action of blocking the flow of the atmospheric gas is naturally maintained even in the firing process.

  In addition, since the internal pressure P7 of the seventh furnace chamber 17 adjacent to the extraction preparation chamber 18 is kept higher than the internal pressure P6 of the sixth furnace chamber 16 adjacent to the seventh furnace chamber 17, the sintered product 42 Even when the extraction preparation chamber 18 is opened to the atmosphere by removing the gas, and the internal pressure thereof decreases, the high internal pressure P7 of the seventh furnace chamber 17 adjacent to the extraction preparation chamber 18 becomes a “wall”, and the seventh furnace chamber The flow of atmospheric gas from the furnace chamber before 17 toward the extraction preparation chamber 18 is blocked. Even in this firing step, the action of blocking the flow of the atmospheric gas is naturally maintained.

  After all, in the row of the second furnace chamber 12 to the sixth furnace chamber 16, the high internal pressures P1 and P7 of the first furnace chamber 11 and the seventh furnace chamber 17 on both sides become “walls”, and the atmosphere gas between the furnace chambers It will be sealed so that no distribution occurs. As a result, fluctuations in the atmospheric gas component ratio and internal pressure of the firing stable part constituted by the furnace room or furnace room group in the intermediate part are suppressed, and a sintered product having stable characteristics can be obtained.

In the embodiment, as in the prior art, the carry-in preparation chamber 10 and the take-out preparation chamber 18 in which the internal air is replaced with N ₂ gas are provided on the workpiece import side and the sintered product take-out side. Therefore, as in the prior art, the carry-in preparation chamber 10 and the adjacent first furnace chamber 11 are closed by the shutter 101, and the air that has entered by bringing the object to be sintered 41 into the carry-in preparation chamber 10 is N _2. After the replacement with the gas, the shutter 101 can be opened, and the object to be sintered 41 can be sent into the first furnace chamber 11 from the carry-in preparation chamber 10.

  When the sintered product 42 is taken out after firing, the sintered product 42 is taken into the take-out preparation chamber 18 filled with an inert gas in advance, and after a certain cooling time, The shutter 181 provided between the take-out preparation chamber 18 is closed, and in this state, the sintered product 42 is taken out from the take-out preparation chamber 18. Thereafter, the air that has entered the extraction preparation chamber 18 in accordance with the sintered product extraction operation can be replaced with an inert gas. Therefore, at the time of carrying in and taking out, it is possible to prevent the atmosphere of the furnace chamber from being disturbed, and to suppress the characteristic fluctuation of the sintered body due to the atmosphere disturbance of the furnace chamber.

Moreover, since the unfired product 41 carried into the carry-in preparation chamber 10 is sent to the first furnace chamber 11 to the seventh furnace chamber 17 and fired, the sintered product is taken out from the take-out preparation chamber 18. Zone control by atmosphere control of the furnace chamber 11 to the seventh furnace chamber 17 is possible. According to the zone control, for example, in the first furnace chamber 11 to the seventh furnace chamber 17, the mixing ratio and the temperature rise characteristic of N ₂ gas and O ₂ gas are individually selected and controlled, and flexible according to the firing process. Atmosphere control and temperature control can be performed, whereby a sintered body 42 with excellent characteristics can be obtained.

  In the example shown in FIG. 1, the internal pressure P0 of the carry-in preparation chamber 10 is higher than the internal pressure P1 of the first furnace chamber 11, and the internal pressure P8 of the extraction preparation chamber 18 is also higher than the internal pressure P7 of the seventh furnace chamber 17. Is also high. According to this internal pressure distribution, in the furnace chamber rows of the first furnace chamber 11 to the seventh furnace chamber 17, the high internal pressures P0 and P8 of the loading preparation chamber 10 and the extraction preparation chamber 18 on both sides become “walls”, and the atmosphere It will be sealed so that gas does not flow between furnace chambers.

  However, the firing furnace internal pressure distribution selected in the present invention has the purpose of containing the atmospheric gas so that it does not flow between the furnace chambers. Therefore, as long as this purpose is achieved, the internal pressure distribution as shown in FIG. It is not necessary to be limited to. Such representative examples are illustrated in FIGS. 2 and 3, parts corresponding to those shown in FIG. 1 are denoted by the same reference numerals, and redundant description is omitted.

  First, in FIG. 2, the internal pressure P0 of the carry-in preparation chamber 10 is lower than the internal pressure P1 of the first furnace chamber 11, and the internal pressure P8 of the extraction preparation chamber 18 is also lower than the internal pressure P7 of the seventh furnace chamber 17. However, the internal pressure P1 of the first furnace chamber 11 is higher than the internal pressure P2 of the second furnace chamber 12, and the internal pressure P7 of the seventh furnace chamber 17 is also higher than the internal pressure P6 of the sixth furnace chamber 16. It has become. Therefore, in the furnace chamber rows of the second furnace chamber 12 to the sixth furnace chamber 16, the high internal pressures P1 and P7 of the first furnace chamber 11 and the seventh furnace chamber 17 on both sides become “walls”, and the furnace of the atmospheric gas It is sealed so that circulation between rooms does not occur.

  Next, in FIG. 3, a fourth furnace chamber having an internal pressure P4 higher than these internal pressures P2 and P6 is included between the second furnace chamber 12 and the sixth furnace chamber 16. Also in this case, as long as the conditions that the internal pressures P1, P2 of the first furnace chamber 11 and the seventh furnace chamber 17 are higher than the internal pressures P2, P6 of the second furnace chamber 12 and the sixth furnace chamber 16, the firing process is satisfied. Therefore, an atmosphere gas flow that is large enough to affect the properties of the sintered product is not generated.

  The internal pressure is controlled by adjusting the relationship between (gas supply amount / time) and (gas exhaust amount / time). This is because the internal pressure is ultimately determined by the balance with the atmospheric gas supply amount and the atmospheric gas exhaust amount.

  The internal pressure may be adjusted in all of the first furnace chamber 11 to the seventh furnace chamber 17, but for the purposes of the present invention, the internal pressure is adjusted at least in the first furnace chamber 11 and the seventh furnace chamber 17. It is necessary to

  The present invention has been described in detail with reference to the preferred embodiments. However, the present invention is not limited to these embodiments, and various modifications can be made by those skilled in the art based on the basic technical idea and teachings. It is self-evident that

It is a figure which shows the schematic structure of the baking apparatus which concerns on this invention, and a baking furnace control method, Comprising: The upper half part (A) shows the structure of a baking apparatus, and the lower half part (B) is related to the control method It is a graph which shows the relationship with the position-pressure (internal pressure) to do. It is a figure which shows the schematic structure of the baking apparatus which concerns on invention, and another example of the baking furnace control method, Comprising: The upper half part (A) shows the structure of a baking apparatus, and the lower half part (B) is a control method It is a graph which shows the relationship with the position-pressure (internal pressure) relevant to. It is a figure which shows another example of the schematic structure of the baking apparatus which concerns on invention, and a baking furnace control method, Comprising: The upper half part (A) shows the structure of a baking apparatus, and the lower half part (B) is control It is a graph which shows the relationship with the position-pressure (internal pressure) relevant to a method.

Explanation of symbols

1 Firing furnace
10 Import preparation room
11-17 First furnace chamber-seventh furnace chamber
18 Preparation room
20, 28, (211, 212) to (271, 272)
Gas supply device
30-38 gas discharge device

Claims (11)

A firing furnace control method for controlling the furnace pressure of a firing furnace,
The firing furnace includes the first furnace chamber to the nth furnace chamber divided into a plurality of n between a carry-in preparation chamber for carrying in the unfired material and a take-out preparation chamber for taking out the sintered product. ,
Keeping the internal pressure of the first to nth furnace chambers higher than atmospheric pressure,
Maintaining the internal pressure of the first furnace chamber adjacent to the carry-in preparation chamber higher than the internal pressure of the second furnace chamber adjacent to the first furnace chamber;
The internal pressure of the nth furnace chamber adjacent to the extraction preparation chamber is kept higher than the internal pressure of the (n-1) furnace chamber adjacent to the nth furnace chamber;
A firing furnace control method including steps.   The firing furnace control method according to claim 1, wherein an r-th furnace chamber (r is a natural number) having an internal pressure higher than the second furnace chamber and the (n-1) furnace chamber. A firing furnace control method.   The firing furnace control method according to claim 1 or 2, wherein the internal pressure is controlled by adjusting a relationship between a gas supply amount and a gas exhaust amount.   4. The firing furnace control method according to claim 3, wherein the internal pressure is adjusted at least in the first furnace chamber and the nth furnace chamber. A firing apparatus including a firing furnace,
The firing furnace includes the first furnace chamber to the nth furnace chamber divided into a plurality of n between a carry-in preparation chamber for carrying in the unfired material and a take-out preparation chamber for taking out the sintered product. ,
In the first to nth furnace chambers, the internal pressure is kept higher than the atmospheric pressure,
The internal pressure of the first furnace chamber adjacent to the carry-in preparation chamber is kept higher than the internal pressure of the second furnace chamber adjacent to the first furnace chamber;
The internal pressure of the nth furnace chamber adjacent to the extraction preparation chamber is kept higher than the internal pressure of the (n-1) furnace chamber adjacent to the nth furnace chamber.
Firing equipment   The firing apparatus according to claim 5, wherein an r-th furnace chamber (r is a natural number) having an internal pressure higher than the second furnace chamber and the (n-1) furnace chamber. Including baking apparatus.   The firing apparatus according to claim 5 or 6, comprising a gas supply device and a gas discharge device, and adjusting a relationship between a gas supply amount by the gas supply device and a gas discharge amount by the gas discharge device. By this, the baking apparatus which controls the said internal pressure.   The firing apparatus according to claim 7, wherein the internal pressure is adjusted at least in the first furnace chamber and the nth furnace chamber. A firing device including a firing furnace, a gas supply device, and a gas discharge device,
The firing furnace has a carry-in preparation room, an extraction preparation room, and a furnace room,
The carry-in preparation chamber is arranged on the carry-in side of the object to be fired, and replaces the internal air with an inert gas.
The take-out preparation chamber is disposed on the fired product take-out side, and replaces the internal air with an inert gas.
The furnace chamber has a first furnace chamber to an nth furnace chamber divided into a plurality of n,
The gas supply device and the gas discharge device are provided in pairs in the carry-in preparation chamber, the take-out preparation chamber, the first furnace chamber, and the nth furnace chamber,
Firing equipment. A firing apparatus according to claim 9, wherein
The gas supply device provided in the first furnace chamber and the second furnace chamber has a function of controlling a mixing ratio of an inert gas and an O ₂ gas.   10. The firing apparatus according to claim 9, wherein the gas supply device and the gas discharge device are provided in the first furnace chamber to the n-th furnace chamber.

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